import Vue from 'vue'
import VueRouter from 'vue-router'

Vue.use(VueRouter)

const routes = [
  {
    path: '/login',
    component:()=>import('../components/Login.vue')
  },
  {
    path: '/home',
    component:()=>import('../components/Home.vue'),
    redirect:'/welcome',
    children:[
      {
        path:'/welcome',
        component:()=>import('../components/Welcome.vue'),
      },
      {
        path:'/users',
        component:()=>import('../components/user/Users.vue'),
      }
    ]
  },
]

const router = new VueRouter({
  mode: 'history',
  base: process.env.BASE_URL,
  routes,
})

// 挂载路由导航守卫
router.beforeEach((to, from, next)=>{
  // to 将要访问的路径
  // from 代表从哪个路径跳转而来
  // next 是一个函数，表示放行
      // next() 放行    next('/login')  强制跳转
  if( to.path === '/login' ){
    next();
  }
  // 获取token
  const tokenStr = window.sessionStorage.getItem('token')
  if(!tokenStr && to.path !== '/login'){
    next('/login')
  }else{
    next();
  }
})

export default router
